<!--
 * @Description: 进度条
 * @Author: zhailei
 * @Date: 2021-01-18 15:17:27
 * @LastEditTime: 2021-05-21 14:30:07
 * 
 * @FilePath: \-cloud-topvui\src\components\TopVUI\custom\TSlider.vue
-->
<template>
  <div class="drag" ref="dragDiv">
    <div class="drag_bg"></div>
    <div class="drag_text">{{ confirmWords }}</div>
    <div
      ref="moveDiv"
      @mousedown="mousedownFn($event)"
      :class="{ handler_ok_bg: confirmSuccess }"
      class="handler handler_bg"
      style="border: 0.5px solid #fff;height: 34px;position: absolute;top: 0px;left: 0px;"
    ></div>
  </div>
</template>

<script>
export default {
  name: "TSlider",
  data() {
    return {
      beginClientX: 0 /*距离屏幕左端距离*/,
      mouseMoveStata: false /*触发拖动状态  判断*/,
      maxwidth: "" /*拖动最大宽度，依据滑块宽度算出来的*/,
      confirmWords: "拖动滑块验证" /*滑块文字*/,
      confirmSuccess: false /*验证成功判断*/,
    };
  },
  methods: {
    isSuccess() {
      return this.confirmSuccess;
    },
    mousedownFn: function(e) {
      if (!this.confirmSuccess) {
        e.preventDefault && e.preventDefault(); //阻止文字选中等 浏览器默认事件
        this.mouseMoveStata = true;
        this.beginClientX = e.clientX;
      }
    }, //mousedoen 事件
    successFunction() {
      this.confirmSuccess = true;
      this.confirmWords = "验证通过";
      if (window.addEventListener) {
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mousemove", this.mouseMoveFn);
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mouseup", this.moseUpFn);
      } else {
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mouseup", () => {});
      }
      document.getElementsByClassName("drag_text")[0].style.color = "#fff";
      document.getElementsByClassName("handler")[0].style.left =
        this.maxwidth + "px";
      document.getElementsByClassName("drag_bg")[0].style.width =
        this.maxwidth + "px";

      this.$emit("onSuccess", true);
    }, //验证成功函数
    mouseMoveFn(e) {
      if (this.mouseMoveStata) {
        let width = e.clientX - this.beginClientX;
        if (width > 0 && width <= this.maxwidth) {
          document.getElementsByClassName("handler")[0].style.left =
            width + "px";
          document.getElementsByClassName("drag_bg")[0].style.width =
            width + "px";
        } else if (width > this.maxwidth) {
          this.successFunction();
        }
      }
    }, //mousemove事件
    moseUpFn(e) {
      this.mouseMoveStata = false;
      var width = e.clientX - this.beginClientX;
      if (width < this.maxwidth) {
        // ---- update-begin- author:sunjianlei --- date:20191009 --- for: 修复获取不到 handler 的时候报错 ----
        let handler = document.getElementsByClassName("handler")[0];
        if (handler) {
          handler.style.left = 0 + "px";
          document.getElementsByClassName("drag_bg")[0].style.width = 0 + "px";
        }
        // ---- update-end- author:sunjianlei --- date:20191009 --- for: 修复获取不到 handler 的时候报错 ----
      }
    }, //mouseup事件
  },
  mounted() {
    this.maxwidth =
      this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth;
    document
      .getElementsByTagName("html")[0]
      .addEventListener("mousemove", this.mouseMoveFn);
    document
      .getElementsByTagName("html")[0]
      .addEventListener("mouseup", this.moseUpFn);
  },
};
</script>

<style scoped>
.drag {
  position: relative;
  background-color: #e8e8e8;
  width: 100%;
  height: 34px;
  line-height: 34px;
  text-align: center;
}
.handler {
  width: 40px;
  height: 32px;
  border: 1px solid #ccc;
  cursor: move;
}
.handler_bg {
  background: #fff
    url()
    no-repeat center !important;
}
.handler_ok_bg {
  background: #fff
    url()
    no-repeat center;
}
.drag_bg {
  background-color: #7ac23c;
  height: 34px;
  width: 0px;
}
.drag_text {
  position: absolute;
  top: 0px;
  width: 100%;
  text-align: center;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
}
</style>
